Business Rules Implementation

 

Hi,

I'm trying to learn more about the business Rules and what they are doing.

Where can I find the various function implementations.

For Example: I have this function 

        Dim connectionString As String = GetConnectionString(si, globals, api)

For the GetConnectionString function where is the code for this funciton ? so I can read and understand what its doing ?

If this is in the API, I have been looking there today, can you reference which folder / document I can get this.

Thanks for your help in advance.